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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd443e1945a63aa33b0889d7d73603d38f8a71ef1e738c45631cc14ae9da7f567' 
  AND token = 'uF6+OqWqtqFiCgOnIlpMy30cx9EcFX0SRw2J4M947lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}